Polypropylene filament geotextile and preparation method and application thereof

Abstract

The application relates to a polypropylene filament geotextile and a preparation method and application thereof, and belongs to the technical field of geotextiles.The preparation raw material of the polypropylene filament geotextile comprises polypropylene chips, toughening master batches, anti-aging master batches and antibacterial master batches; wherein the toughening master batches comprise polyvinyl chloride particles; the polypropylene filament geotextile is prepared by mixing and melting the polypropylene chips, the toughening master batches, the anti-aging master batches and the antibacterial master batches to obtain a melt, and the melt is sequentially subjected to melt extrusion, spinning, cooling and drafting, wire laying, lubrication and reinforcement, thickening agent impregnation, tentering and winding to form a roll; wherein the thickening agent used in the thickening agent impregnation comprises a polyacrylate compound.The polypropylene filament geotextile is toughened by using nano polyvinyl chloride particles as a toughening agent, so that the toughening effect of the polypropylene filament geotextile is improved; and the polypropylene filament geotextile is improved in water drainage function by using a polyacrylate compound as a thickening agent.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical materials technology, specifically relating to polypropylene filament geotextiles, their preparation methods, and applications. Background Technology

[0002] Polypropylene filament spunbond needle-punched geotextiles are widely used in water conservancy projects for seepage prevention, reinforcement, and protection due to their balanced mechanical properties and stable pore structure. However, under long-term and complex hydrological environments, existing products generally suffer from three major technical bottlenecks: 1. Insufficient mechanical properties: Traditional products have limited fiber entanglement strength. Under the scouring of high-speed water flow and the piercing of mud and gravel, they are prone to tensile breakage and puncture damage, making it difficult to meet the requirements of high-standard engineering. 2. Poor aging resistance: Long-term exposure to ultraviolet rays, dry and wet cycles and microbial environments can easily degrade polypropylene molecular chains, leading to material embrittlement, a sharp decrease in strength, and a service life of only 3-5 years, resulting in high maintenance costs. 3. Low ecological compatibility: The surface of the fabric is smooth and has weak bonding force with the soil, which can easily cause soil erosion; moreover, harmful microorganisms can easily grow on its surface, which may cause micro-pollution to the water body, making it difficult to conform to the concept of modern ecological water conservancy. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a polypropylene filament geotextile, its preparation method, and its application. It uses polypropylene chips, toughening masterbatch, anti-aging masterbatch, antibacterial masterbatch, and a thickening agent as raw materials. The process involves melting in a twin-screw extruder, filtering impurities through a melt filter, spinning in a spinning box and components, cooling and stretching, filament laying, lubrication and reinforcement, thickening agent impregnation, stretching and shaping, and winding into rolls to form a unique polypropylene filament geotextile product for hydraulic engineering. This polypropylene filament geotextile product features high strength, corrosion resistance, oxidation resistance, and good permeability, effectively solving the problems of low strength, easy aging, and easy corrosion in existing geotextiles.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] In a first aspect, the present invention provides a polypropylene filament geotextile, wherein the raw materials for preparing the polypropylene filament geotextile include polypropylene chips, toughening masterbatch, anti-aging masterbatch, and antibacterial masterbatch; wherein the toughening masterbatch includes polyvinyl chloride particles. The polypropylene filament geotextile is prepared by melting polypropylene chips, toughening masterbatch, anti-aging masterbatch, and antibacterial masterbatch together to obtain a melt. The melt is then sequentially processed through melt extrusion, spinning, cooling and stretching, web laying, lubrication and reinforcement, thickening agent impregnation, stretching and setting, and winding into rolls. The thickening agents used in the impregnation process include polyacrylate compounds.

[0006] The polypropylene filament geotextile provided by this invention uses polyacrylate compounds as thickening agents to thicken the polypropylene filament geotextile, effectively filling the pores between the fibers of the polypropylene filament geotextile, making the geotextile more fluffy and thicker, thus giving the geotextile better drainage and water conduction functions.

[0007] Optionally, the raw materials for preparing the polypropylene filament geotextile, by weight percentage, include the following components: Polypropylene chips 67%-85%, toughening masterbatch 10%-20%, anti-aging masterbatch 0.5%-3%, and antibacterial masterbatch 4.5%-10%.

[0008] Optionally, the size of the polyvinyl chloride particles is 1-100 nm.

[0009] The polypropylene filament geotextile provided by this invention uses nano-polyvinyl chloride particles as the main component of the toughening agent. Because the nano-polyvinyl chloride particles have a size of 1-100 nm, they possess an extremely large specific surface area and highly unsaturated surface atoms, resulting in very high surface activity. The epoxy groups (generated through oxidation during melting) interact with the nanoparticles at the interface, forming forces far greater than van der Waals forces, effectively initiating microcracks and absorbing energy. These epoxy groups can both induce crazes and terminate cracks. Simultaneously, the nano-polyvinyl chloride particles possess strong rigidity; when cracks propagate, they encounter the nanoparticles and undergo tufting or deflection, absorbing energy and achieving the toughening effect. Furthermore, the nano-polyvinyl chloride particles have good compatibility with polypropylene resin, enhancing the matrix's ability to disperse and absorb impact energy, leading to increased toughness.

[0010] Optionally, the antibacterial masterbatch includes a carrier and an antibacterial agent, wherein the antibacterial agent includes at least one of nano zinc oxide, silver oxide and titanium dioxide, preferably nano zinc oxide; the carrier includes polypropylene resin.

[0011] In this invention, the antibacterial masterbatch is prepared by using polypropylene resin as a carrier and adding nano zinc oxide as an antibacterial agent.

[0012] The polypropylene filament geotextile provided by this invention is prepared using an antibacterial masterbatch containing nano-zinc oxide. Due to the combination of zinc and oxygen, the electronegativity of the nano-zinc oxide surface is greater than that of ordinary metal ions. This electronegativity mainly originates from its nanoscale size and structure. Because of its nanoscale size, more zinc atoms are exposed on the surface, resulting in a higher surface charge. Meanwhile, the cell wall (peptidoglycan, teichoic acid, lipopolysaccharide) and cell membrane (phospholipids) on the cell surface are negatively charged. According to the principle of opposite charges attracting, bacteria will indiscriminately adsorb these components. Zinc ions are released from the nano-zinc oxide surface, replacing the Ca and Mg ions that originally regulate physiological activities, causing protein denaturation and coagulation, enzyme inactivation, and the failure of the original functions of the cell wall and cell membrane, thereby killing bacteria and microorganisms and achieving the antibacterial purpose.

[0013] Optionally, the anti-aging masterbatch includes a carrier and an antioxidant. Preferably, the carrier includes polypropylene resin.

[0014] The antioxidant content in the anti-aging masterbatch used in this invention is 20%-50% (e.g., 25%, 30%, 35% or 40%). After being mixed with polypropylene resin, each filament has anti-aging properties. According to a third-party testing agency (fluorescent ultraviolet lamp for 430 hours), the tensile strength retention rate is ≥85%.

[0015] Secondly, the present invention provides a method for preparing the above-mentioned polypropylene filament geotextile, comprising the following steps: Polypropylene chips, toughening masterbatch, anti-aging masterbatch, and antibacterial masterbatch are mixed and melted to obtain a melt. This melt is then sequentially processed through melt extrusion, spinning, cooling and stretching, web laying, lubrication and reinforcement, thickening agent impregnation, stretching and setting, and winding into rolls. In the thickening agent impregnation process, the geotextile obtained by lubrication and reinforcement is impregnated with the thickening agent and then pressed by an embossing roller to form an uneven pattern on the surface of the geotextile.

[0016] Optionally, in the mixing and melting process, toughening masterbatch, anti-aging masterbatch and antibacterial masterbatch are mixed to obtain composite masterbatch, and then polypropylene chips and composite masterbatch are mixed and melted to obtain melt.

[0017] Preferably, the mixing and melting process employs a screw extruder segmented heating technology, wherein the screw extruder is divided into 10 zones; the temperature settings for each zone are as follows: Zones 1-2: 200℃-208℃, Zones 3-4: 208℃-216℃, Zones 5-6: 216℃-224℃, Zones 7-8: 224℃-232℃, Zones 9-10: 232℃-240℃.

[0018] Preferably, the mixing and melting is performed using a twin-screw extruder.

[0019] Optionally, the preparation method further includes melt filtration to remove impurities.

[0020] In this invention, polypropylene chips, toughening masterbatch, anti-aging masterbatch and antibacterial masterbatch are mixed and melted to obtain a melt. The melt is then subjected to melt extrusion, melt filtration to remove impurities, and then spinning.

[0021] Preferably, the melt filtration and impurity removal uses a melt filter.

[0022] Preferably, the spinning is performed using a spinning box.

[0023] Optionally, the cooling stretching includes mechanical stretching, side-blowing cooling, and airflow stretching performed sequentially.

[0024] Preferably, the side-blowing air temperature is set to 12~18℃ (i.e., 15℃±3℃), the side-blowing air velocity is set to 0.5~1.5 m / s (i.e., 1±0.5 m / s), and the side-blowing air humidity is set to 60~70% (i.e., 65%±5%). Preferably, the pressure of the airflow stretching is 0.60-0.70 bar (e.g., 0.65 bar). In this invention, the original fibers formed by spinning are mechanically drawn into monofilaments (or bundles), and then the bundles are drawn onto the mesh curtain by airflow drawing.

[0025] Optionally, the device for laying the wire mesh is a wire-forming curtain machine equipped with an electrostatic eliminator and a spraying device.

[0026] In this invention, the static eliminator and spraying equipment are used to eliminate static electricity on the fabric surface and to turn the fabric over. The fiber web obtained by the filament laying process is evenly laid on the web forming machine.

[0027] Optionally, in the swaying wire mesh laying process, two static eliminators and one spray system are installed on the entire mesh curtain.

[0028] Optionally, in the spray system, the spray rate of each nozzle is set to 35~45 ml / min (40±5 ml / min), and the concentration of the spinning oil is 5.5~6.5% (e.g., 6%).

[0029] In this invention, the spinning oil is used in the spraying system, and its main function is to protect the fibers from damage by the needles.

[0030] Optionally, the lubrication and reinforcement includes pre-needling, main needle punching I, and main needle punching II; before the fiber web enters the pre-needling stage, it needs to be sprayed with spinning oil (as a lubricant).

[0031] Optionally, the pre-needling operation parameters include: acupuncture density of 40-60 g / cm³. 2(i.e., 50±10 / cm) 2 The needle insertion depth is 10-12 mm (i.e., 11.5±0.5 mm).

[0032] Optionally, the operating parameters of the main acupuncture I include: acupuncture density of 55-75 g / cm³ (i.e., 65±10 g / cm³). 2 The needle insertion depth is 11.3-12.3 mm (i.e., 11.8±0.5 mm).

[0033] Optionally, the operating parameters of the main acupuncture II include: acupuncture density of 55-75 g / cm³ (i.e., 65±10 g / cm³). 2 The needle insertion depth is 11.3-12.3 mm (i.e., 11.8±0.5 mm). Optionally, the lubrication and reinforcement process employs three acupuncture machines, including one pre-acupuncture machine and two main acupuncture machines.

[0034] Preferably, the mass concentration of the thickening agent in the impregnation is 10%-15%.

[0035] Preferably, in the thickening agent impregnation process, after the geotextile obtained by lubrication and reinforcement is fully impregnated with the thickening agent, it is squeezed by an embossing roller to squeeze out the excess thickening agent and form an uneven pattern on the surface of the geotextile.

[0036] Optionally, in the stretching and setting process, the stretching temperature is set to 115℃-150℃.

[0037] In this invention, during the stretching and shaping process, the stretching amount after six-zone stretching can be adjusted according to customer requirements. By adjusting the temperature and stretching amount, the product width can be arbitrarily switched between 3500 mm and 5500 mm. Furthermore, the longitudinal and transverse strength ratio reaches 1:1.

[0038] Optionally, the width of the stretch-formed polypropylene filament geotextile product is 3500 mm-5500 mm, and the ratio of longitudinal to transverse strength is (0.9-1.1):1 (e.g., 1:1).

[0039] Optionally, the diameter of the wound polypropylene filament geotextile product is 30 cm-110 cm.

[0040] In this invention, during the winding process, the product roll diameter can be arbitrarily switched between 30 cm and 110 cm according to customer requirements. The use of automatic winding technology saves significant manpower and resources.

[0041] The method for preparing polypropylene filament geotextile provided by this invention can produce polypropylene filament needle-punched geotextile for hydraulic engineering. Taking a 500 g polypropylene filament geotextile product as an example, the longitudinal and transverse tensile strength is ≥35 KN / m, the longitudinal and transverse tensile elongation is ≥70%, the longitudinal and transverse tear strength is ≥1100 N, the CBR bursting strength is ≥5.5 KN, the UV resistance retention rate is ≥85%, and the vertical permeability coefficient is ≥0.25 cm / s. All the performance characteristics of the product fully meet and exceed the technical requirements specified in relevant standards such as GB / T 17639-2023.

[0042] Thirdly, the present invention provides an application of the above-mentioned polypropylene filament geotextile in the field of water conservancy engineering.

[0043] In this invention, the above-mentioned technical features can be freely combined to form new technical solutions, provided they do not conflict with each other.

[0044] Compared with the prior art, the above-mentioned technical solution provided by the present invention has the following beneficial technical effects: (1) The polypropylene filament geotextile provided by the present invention uses nano-polyvinyl chloride particles as the main component of toughening agent. Nano-polyvinyl chloride particles can both induce silver creasing and terminate cracking. At the same time, the strong rigidity of polyvinyl chloride particles and their good compatibility with polypropylene resin are conducive to achieving the toughening effect of polypropylene filament geotextile. (2) The polypropylene filament geotextile provided by the present invention has a positively charged surface due to the presence of antibacterial agents such as nano zinc oxide, which can non-selectively adsorb bacteria and kill bacteria and microorganisms to achieve the purpose of antibacterial. Experiments show that the polypropylene filament geotextile product has a bactericidal rate of more than 95% against Gram-positive bacteria, Escherichia coli, Staphylococcus aureus and other bacteria, and the antibacterial effect is long-lasting. (3) The preparation method of polypropylene filament geotextile provided by the present invention uses polyacrylate compounds as thickening agents to thicken the polypropylene filament geotextile, effectively filling the pores between the fibers of the polypropylene filament geotextile, making the geotextile more fluffy and thicker, thus the geotextile has better drainage function. (4) The polypropylene filament geotextile provided by the present invention has the characteristics of high strength, corrosion resistance, aging resistance and good water permeability, which is more in line with the needs of water conservancy projects and therefore has a broad market prospect. Attached Figure Description

[0045] Figure 1 This is a flowchart illustrating the preparation process of a polypropylene filament geotextile according to the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, this specification shall prevail.

[0048] The raw material information in the following embodiments and comparative examples is as follows: Spinning oil: Nanyang Zhenhua Additives Co., Ltd., brand name: BF500FS; The anti-aging masterbatch is Suqian Liansheng L-816C; The antibacterial masterbatch is selected from at least one of the grades PPAO446093, PPAO446094 and PPAO446095 produced by Evante Materials Technology (Guangzhou) Co., Ltd. The toughening masterbatch is from Shandong Wanhua Science & Technology Co., Ltd., grade 5007; The thickening agent is from Shandong Bochao New Material Technology Co., Ltd., brand name ZH-RB06.

[0049] Example 1 A method for preparing polypropylene filament geotextile, such as... Figure 1 As shown, it includes the following steps: A composite masterbatch is obtained by mixing toughening masterbatch, anti-aging masterbatch, and antibacterial masterbatch. Polypropylene chips are then mixed and melted with the composite masterbatch using a twin-screw extruder. The melt is then extruded, spun, cooled and stretched, laid into a web, lubricated and reinforced, impregnated with a thickening agent, stretched and set, wound into rolls, and packaged to obtain the polypropylene filament geotextile product. The raw material feeding ratio is as follows: Polypropylene resin, toughening masterbatch, Anti-aging masterbatch and Antibacterial masterbatch.

[0050] Specifically, the mixing and melting process employs a twin-screw extruder with segmented heating technology, dividing the twin-screw extruder into 10 zones; the temperature settings for each zone are as follows: Zones 1-2: 200℃-208℃; Zones 3-4: 208℃-216℃; Zones 5-6: 216℃-224℃; Zones 7-8: 224℃-232℃; Zones 9-10: 232℃-240℃.

[0051] During the spinning process, a spinning box is used for spinning, and the temperature of the spinning box is 235℃.

[0052] During the cooling and stretching process, the original fibers formed by spinning are mechanically stretched into monofilaments (or bundles), and then the bundles are stretched onto the web forming curtain by airflow stretching.

[0053] In the web-laying process, the apparatus for web-laying is a web-forming curtain machine equipped with two static eliminators and one spray system. The static eliminators and spray system are used to eliminate static electricity on the fabric surface and to turn the fabric over. The fiber web obtained after web-laying is evenly laid on the web-forming curtain machine. In the spray system, the spray rate of each nozzle is set to 40±5 ml / min, and the concentration of the spinning oil is 6%. The airflow stretching pressure is 0.65 bar.

[0054] Lubrication and reinforcement are achieved using three needle punching machines: one pre-needling machine and two main needle punching machines. These machines perform pre-needling, main needle punching I, and main needle punching II on the fiber web obtained from the filament laying process to lubricate and reinforce the resulting geotextile. Specifically, before pre-needling, the fiber web is sprayed with spinning oil (as a lubricant). After pre-needling, spinning oil (as a finishing agent) is applied for finishing, followed by main needle punching I and main needle punching II in sequence. The pre-needling operating parameters include a needle punching density of 50 / cm². 2 The needle insertion depth was 11.5 mm; the operating parameters for the main needle insertion I included: needle density of 65 / cm³. 2 The needle insertion depth was 11.8 mm. The operating parameters for the main needle insertion II included: a needle density of 65 / cm². 2 The needle insertion depth was 11.8 mm.

[0055] In the thickening agent impregnation process, the lubricated and reinforced geotextile is impregnated with a thickening agent, and then pressed by an embossing roller to form an uneven pattern on the surface of the geotextile. The mass concentration of the thickening agent is 10%. Specifically, the thickening agent is injected into a water tank, and the lubricated and reinforced geotextile is completely immersed by a pressure roller for 20 seconds. Then, it is pressed by an embossing roller, which on the one hand forms an uneven pattern, and on the other hand squeezes out excess thickening agent from the surface of the geotextile, causing it to fall into the water tank.

[0056] During the stretching and setting process, the geotextile impregnated with the thickening agent undergoes six-zone stretching, with a stretching temperature of 130℃. The stretching amount after six-zone stretching can be adjusted according to customer requirements. By adjusting the temperature and stretching amount, the product width can be arbitrarily switched between 3500 mm and 5500 mm, and the longitudinal and transverse strength ratio reaches 1:1.

[0057] Comparative Example 1 A method for preparing polypropylene filament geotextile differs from Example 1 in that it does not include a thickening agent impregnation step.

[0058] Comparative Example 2 A method for preparing polypropylene filament geotextile differs from Example 1 in that the composite masterbatch does not contain toughening masterbatch. Example 2 A method for preparing polypropylene filament geotextile, such as... Figure 1 As shown, it includes the following steps: The toughening masterbatch, anti-aging masterbatch and antibacterial masterbatch are mixed to obtain a composite masterbatch. Polypropylene chips are mixed and melted with the composite masterbatch using a twin-screw extruder to obtain a melt. The melt is then extruded, spun, cooled and stretched, laid into a web, lubricated and reinforced, impregnated with a thickening agent, stretched and shaped, wound into rolls and packaged to obtain a polypropylene filament geotextile product.

[0059] The raw material feeding ratio is 77% polypropylene resin, 15% toughening masterbatch, 3% anti-aging masterbatch, and 5% antibacterial masterbatch. Other steps and process parameters are the same as in Example 1.

[0060] Comparative Example 3 A method for preparing polypropylene filament geotextile differs from Example 2 in that it does not include a thickening agent impregnation step. Comparative Example 4 A method for preparing polypropylene filament geotextile differs from Example 2 in that the composite masterbatch does not contain toughening masterbatch. Example 3 A method for preparing polypropylene filament geotextile differs from Example 1 in that the mass concentration of the thickening agent is 15% and the impregnation time is 20 s.

[0061] Performance testing of polypropylene filament geotextile products The anti-aging properties, mechanical properties, and water permeability of the polypropylene filament geotextiles in the various embodiments and comparative examples of this invention were tested according to the provisions of GB / T 17639-2023 "Geosynthetic Materials - Spunbond Needle-punched Nonwoven Geotextiles". The antibacterial properties were tested using GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles - Part 3: Vibration Method". The results are shown in Tables 1 and 2. Table 1. Anti-aging properties, antibacterial properties, and water permeability of polypropylene filament geotextile.

[0062] Table 2 Mechanical properties of polypropylene filament geotextile

[0063] As shown in Tables 1 and 2, the 500 g polypropylene filament geotextile product prepared in the embodiments of the present invention has a longitudinal and transverse tensile strength ≥35 KN / m, a longitudinal and transverse tensile elongation ≥70%, a longitudinal and transverse tear strength ≥1100 N, a CBR bursting strength ≥5.5 KN, and a vertical permeability coefficient ≥0.25 cm / s. All performance characteristics of the product fully meet and exceed the technical requirements specified in the relevant standards of the national standard GB / T17639-2023.

[0064] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A polypropylene filament geotextile, characterized in that, The raw materials for preparing the polypropylene filament geotextile include polypropylene chips, toughening masterbatch, anti-aging masterbatch, and antibacterial masterbatch; wherein, the toughening masterbatch includes polyvinyl chloride particles. The polypropylene filament geotextile is prepared by melting polypropylene chips, toughening masterbatch, anti-aging masterbatch, and antibacterial masterbatch together to obtain a melt. The melt is then sequentially processed through melt extrusion, spinning, cooling and stretching, web laying, lubrication and reinforcement, thickening agent impregnation, stretching and setting, and winding into rolls. The thickening agents used in the impregnation process include polyacrylate compounds.

2. The polypropylene filament geotextile according to claim 1, characterized in that, The raw materials for preparing the polypropylene filament geotextile, by weight percentage, include the following components: Polypropylene chips 67%-85%, toughening masterbatch 10%-20%, anti-aging masterbatch 0.5%-3%, and antibacterial masterbatch 4.5%-10%.

3. The polypropylene filament geotextile according to claim 1, characterized in that, The size of the polyvinyl chloride particles is 1-100 nm.

4. The polypropylene filament geotextile according to claim 1, characterized in that, The antibacterial masterbatch includes a carrier and an antibacterial agent, wherein the antibacterial agent includes at least one of nano zinc oxide, silver oxide, and titanium dioxide; the carrier includes polypropylene resin. The anti-aging masterbatch includes a carrier and an antioxidant, wherein the carrier includes polypropylene resin, and the antioxidant content in the anti-aging masterbatch is 20%-50%.

5. A method for preparing a polypropylene filament geotextile according to any one of claims 1-4, characterized in that, Includes the following steps: Polypropylene chips, toughening masterbatch, anti-aging masterbatch, and antibacterial masterbatch are mixed and melted to obtain a melt. This melt is then sequentially processed through melt extrusion, spinning, cooling and stretching, web laying, lubrication and reinforcement, thickening agent impregnation, stretching and setting, and winding into rolls. In the thickening agent impregnation process, the geotextile obtained by lubrication and reinforcement is impregnated with the thickening agent and then pressed by an embossing roller to form an uneven pattern on the surface of the geotextile.

6. The method for preparing polypropylene filament geotextile according to claim 5, characterized in that, In the mixed melting process, toughening masterbatch, anti-aging masterbatch and antibacterial masterbatch are mixed to obtain composite masterbatch, and then polypropylene chips and composite masterbatch are mixed and melted to obtain melt; The cooling stretching includes mechanical stretching, side-blowing cooling, and airflow stretching performed sequentially. The device for laying the wire mesh is a wire mesh forming machine equipped with an electrostatic eliminator and a spraying device; The lubrication and reinforcement process includes pre-needling, main needle punching I, and main needle punching II; before the fiber web enters the pre-needling stage, spinning oil needs to be sprayed as a lubricant. In the thickening agent impregnation process, the geotextile obtained by lubrication and reinforcement is fully impregnated with the thickening agent, and then squeezed by the embossing roller. While squeezing out the excess thickening agent, an uneven pattern is formed on the surface of the geotextile. During the stretching and setting process, the stretching temperature is set to 115℃-150℃.

7. The method for preparing polypropylene filament geotextile according to claim 6, characterized in that, The mixing and melting process employs a segmented heating technology using a screw extruder, which divides the screw extruder into 10 zones; the temperature settings for each zone are as follows: Zones 1-2: 200℃-208℃, Zones 3-4: 208℃-216℃, Zones 5-6: 216℃-224℃, Zones 7-8: 224℃-232℃, Zones 9-10: 232℃-240℃; The side-blowing temperature is set to 12~18℃, the side-blowing wind speed is set to 0.5~1.5 m / s, the side-blowing humidity is set to 60~70%, and the airflow stretching pressure is 0.60-0.70 bar. In the aforementioned spinning netting process, two static eliminators and one spray system are installed on the entire netting curtain; in the spray system, the spray rate of each nozzle is set to 35~45 ml / min, and the concentration of the spinning oil is 5.5~6.5%; The pre-acupuncture operation parameters include: acupuncture density of 40-60 g / cm³. 2 The acupuncture depth is 10-12 mm; the operating parameters of the main acupuncture I include: acupuncture density of 55-75 g / cm and acupuncture depth of 11.3-12.3 mm; the operating parameters of the main acupuncture II include: acupuncture density of 55-75 g / cm and acupuncture depth of 11.3-12.3 mm. In the impregnation of the thickening agent, the mass concentration of the thickening agent is 10%-15%.

8. The method for preparing polypropylene filament geotextile according to any one of claims 5-7, characterized in that, The preparation method further includes melt filtration for impurity removal, wherein the melt filtration for impurity removal employs a melt filter.

9. The method for preparing polypropylene filament geotextile according to any one of claims 5-7, characterized in that, The width of the stretch-formed polypropylene filament geotextile product is 3500 mm-5500 mm, and the ratio of longitudinal to transverse strength is (0.9-1.1):1; The diameter of the wound polypropylene filament geotextile product is 30 cm-110 cm.

10. An application of a polypropylene filament geotextile in the field of water conservancy engineering, characterized in that, The polypropylene filament geotextile is prepared using any one of the polypropylene filament geotextiles according to claims 1-4, or by the preparation method of polypropylene filament geotextile according to any one of claims 4-9.

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